Add support for capacity reservations in ec2-controller

[fizashaikh]

Is your feature request related to a problem?
The ACK ec2-controller currently does not support creating Capacity Reservations in k8s.

Describe the solution you'd like
I would like the ability for creating Capacity Reservations by applying K8s resource manifests into the clusters where ec2-controller is deployed.

Describe alternatives you've considered
Alternatives are using tools like CloudFormation or Terraform however having it supported through the operator would be great as we already use it.